摘要：This paper presents a low power 10 bit 300 ksps successive approximation register analog-to-digital converter （SAR ADC） which is applied in wireless sensor network （WSN） applications. A single ended energy- saving split capacitor DAC array and a latch comparator with a rail to rail input stage are utilized to implement the ADC, which can reduce power dissipation while expanding the full scale input range and improve the signal-to- noise ratio （SNR）. For power optimization the supply voltage of the SAR ADC is designed to be as low as 2 V. Four analog input channels are designed which make the ADC more suitable for WSN applications. The prototype circuit is fabricated using 3.3 V, 0.35μm 2P4M CMOS technology and occupies an active chip area of 1.23 mm2. The test results show that the power dissipation is only 200μW at a 2 V power supply and a sampling rate of 166 ksps. The calculated SNR is 58.25 dB, the ENOB is 9.38 bit and the FOM is 4.95 p J/conversion-step.

摘要：数据采集与处理系统的设计是现代信号处理系统的基础,被广泛应用于雷达、通信、图像处理、遥感遥测等领域。在对WCDMA数字基带接收机的设计中,提出了一种基于FPGA和DSP的高速数据采集方案。该方案将A/D采样的数据送往FPGA,经过FPGA预处理后送到DSP,最终通过CPCI接口送到主控台。详细介绍了设计思想、具体的硬件连接以及FPGA设计的仿真结果。

摘要：针对音频BSS(盲源分离)瞬时模型的多信源多传感器问题,提出一种严格的多路并行同步数据采集的ADC方案。首先介绍ADC AD7656的性能特点,提出并实现一种并行同步多路音频数据采集的系统方案。着重介绍AD7656周围电路的设计和控制逻辑的实现,解决多路采集时序及数据分离的难题;设计完成PCI采集系统的数据接口和驱动程序;采用CPLD作控制核心,简化设计,且方便应用的扩展;最后,给出测试结果。该系统已实际应用于相关课题的研究。

摘要：本文采用MOCVD工艺,通过调整衬底温度(固定其它工艺参数)来沉积用于太阳电池的InxGa1-xN薄膜,并利用X射线衍射仪(XRD)、X射线荧光光谱仪(XRF)、扫描电子显微镜(SEM)和台阶仪来分析研究其结构特性.衬底温度较低时有利于薄膜的In注入,衬底温度较高时有利于沉积高结晶质量的InxGa1-xN薄膜.当衬底温度为470℃时,在硅衬底上所沉积的InxGa1-xN薄膜In含量较高,为46.92%;薄膜表面光滑致密,粗糙度小;颗粒较大,且颗粒大小均匀.